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| | <StructureSection load='6ik8' size='340' side='right'caption='[[6ik8]], [[Resolution|resolution]] 2.80Å' scene=''> | | <StructureSection load='6ik8' size='340' side='right'caption='[[6ik8]], [[Resolution|resolution]] 2.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6ik8]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Lycopersicon_esculentum Lycopersicon esculentum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6IK8 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6IK8 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6ik8]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Solanum_lycopersicum Solanum lycopersicum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6IK8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6IK8 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TBG4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4081 Lycopersicon esculentum])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Beta-galactosidase Beta-galactosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.23 3.2.1.23] </span></td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6ik8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ik8 OCA], [https://pdbe.org/6ik8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ik8 RCSB], [https://www.ebi.ac.uk/pdbsum/6ik8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ik8 ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6ik8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ik8 OCA], [http://pdbe.org/6ik8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6ik8 RCSB], [http://www.ebi.ac.uk/pdbsum/6ik8 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6ik8 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/O81100_SOLLC O81100_SOLLC] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Beta-galactosidase]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Lycopersicon esculentum]] | + | [[Category: Solanum lycopersicum]] |
| - | [[Category: Igarashi, K]] | + | [[Category: Igarashi K]] |
| - | [[Category: Ishimaru, M]] | + | [[Category: Ishimaru M]] |
| - | [[Category: Matsuyama, K]] | + | [[Category: Matsuyama K]] |
| - | [[Category: Nakae, S]] | + | [[Category: Nakae S]] |
| - | [[Category: Tada, T]] | + | [[Category: Tada T]] |
| - | [[Category: Fruit ripening]]
| + | |
| - | [[Category: Glycoside hydrolase]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Plant cell wall related enzyme]]
| + | |
| Structural highlights
Function
O81100_SOLLC
Publication Abstract from PubMed
MAIN CONCLUSION: TBG4 recognize multiple linkage types substrates due to having a spatially wide subsite + 1. This feature allows the degradation of AGI, AGII, and AGP leading to the fruit ripening. beta-galactosidase (EC 3. 2. 1. 23) catalyzes the hydrolysis of beta-galactan and release of D-galactose. Tomato has at least 17 beta-galactosidases (TBGs), of which, TBG 4 is responsible for fruit ripening. TBG4 hydrolyzes not only beta-1,4-bound galactans, but also beta-1,3- and beta-1,6-galactans. In this study, we compared each enzyme-substrate complex using X-ray crystallography, ensemble refinement, and docking simulation to understand the broad substrate-specificity of TBG4. In subsite - 1, most interactions were conserved across each linkage type of galactobioses; however, some differences were seen in subsite + 1, owing to the huge volume of catalytic pocket. In addition to this, docking simulation indicated TBG4 to possibly have more positive subsites to recognize and hydrolyze longer galactans. Taken together, our results indicated that during tomato fruit ripening, TBG4 plays an important role by degrading arabinogalactan I (AGI), arabinogalactan II (AGII), and the carbohydrate moiety of arabinogalactan protein (AGP).
Substrate-recognition mechanism of tomato beta-galactosidase 4 using X-ray crystallography and docking simulation.,Matsuyama K, Kondo T, Igarashi K, Sakamoto T, Ishimaru M Planta. 2020 Oct 3;252(4):72. doi: 10.1007/s00425-020-03481-4. PMID:33011862[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Matsuyama K, Kondo T, Igarashi K, Sakamoto T, Ishimaru M. Substrate-recognition mechanism of tomato beta-galactosidase 4 using X-ray crystallography and docking simulation. Planta. 2020 Oct 3;252(4):72. doi: 10.1007/s00425-020-03481-4. PMID:33011862 doi:http://dx.doi.org/10.1007/s00425-020-03481-4
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